/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.web.tomcat;

import java.util.Set;
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import lombok.extern.slf4j.Slf4j;
import org.hisp.dhis.webapi.servlet.DhisWebApiWebAppInitializer;

/**
 * This code is a modified version of the original code from Spring Boot project.
 *
 * <p>{@link ServletContainerInitializer} used to trigger {@link ServletContextInitializer
 * ServletContextInitializers} and track startup errors.
 *
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
@Slf4j
class TomcatStarter implements ServletContainerInitializer {

  private volatile Exception startUpException;

  @Override
  public void onStartup(Set<Class<?>> classes, ServletContext servletContext)
      throws ServletException {
    try {
      DhisWebApiWebAppInitializer dhisWebApiWebAppInitializer = new DhisWebApiWebAppInitializer();
      dhisWebApiWebAppInitializer.onStartup(servletContext);
    } catch (Exception ex) {
      this.startUpException = ex;
      // Prevent Tomcat from logging and re-throwing when we know we can
      // deal with it in the main thread, but log for information here.
      if (log.isErrorEnabled()) {
        log.error(
            "Error starting Tomcat context. Exception: "
                + ex.getClass().getName()
                + ". Message: "
                + ex.getMessage());
      }
    }
  }

  Exception getStartUpException() {
    return this.startUpException;
  }
}
